1968 Morgan 4-4 Series Tires

The 1968 Morgan 4-4 Series uses two primary tire sizes: 560-15 in bias-ply construction and 155R15 in radial construction. Both are 15-inch fitments, so the main difference is not wheel diameter but the tire type and sizing system used on the car.

That means the first decision is whether the Morgan should keep a traditional bias-ply presentation or use the radial fitment. Once that direction is settled, compare wheel width, tire appearance, and the intended use of the car, especially if it has been restored, modified, or fitted with wheels that differ from its original-style setup.

The 1968 Morgan 4-4 Series uses a 15-inch rim with both of its primary tire sizes. That applies whether the car is running the 560-15 bias-ply fitment or the 155R15 radial fitment, so rim diameter remains consistent across the covered setup.

Rim diameter is only part of the fitment picture, though. Wheel width also matters, especially when moving between bias-ply and radial options or considering a radial equivalent for the 560-15 size. Checking the actual wheel on the car is worthwhile because older sports cars are often fitted with replacement wheels during long ownership histories.

The 1968 Morgan 4-4 Series Base follows the same overall fitment pattern, using either 560-15 in bias-ply construction or 155R15 in radial construction. Both fitments share the same 15-inch rim diameter, so the choice is centered on tire construction and style rather than a different wheel size.

For the Base model, that makes tire selection fairly straightforward. A buyer still needs to decide whether the goal is a more traditional, restoration-minded bias-ply look or a radial setup in a narrow period-style size. Confirming current wheel width and any suspension changes will help narrow the choice further.

560-15 is the bias-ply tire size for the 1968 Morgan 4-4 Series. It uses an older numeric sizing format and represents the traditional fitment direction for this car, with available choices in blackwall, narrow whitewall, and wide whitewall sidewall treatments.

A buyer considering 560-15 should think about the role the tire plays in the car's overall character. Bias-ply construction supports a more vintage presentation, while wheel width and intended use still need attention before choosing among the available products. That is especially important on a low-production sports car that may not still wear its original-style wheels.

Radial equivalents for 560-15 include 155R15 and 560R15. The 155R15 is the 80-series metric radial equivalent, while 560R15 is the bias-look radial equivalent for buyers who want radial construction in a more traditional-looking format.

Those sizes should be viewed as alternatives to evaluate, not automatic substitutions. The recommended rim-width range for the equivalent setup is 4 to 5 inches, and final choice should also take wheel dimensions, tire clearance, and the current stance of the car into account before changing from the original bias-ply direction.

Both approaches are relevant to the 1968 Morgan 4-4 Series because the car is supported by a 560-15 bias-ply fitment and a 155R15 radial fitment. Bias-ply tends to suit a more traditional presentation, while the radial path keeps the same 15-inch rim diameter in a more modern construction format.

The better choice depends on how the car will be used and how closely its tire appearance should follow a vintage style. Owners often start by deciding whether preservation of period character matters most, then confirm wheel width and clearance so the final selection matches the car as it actually sits today.

Choosing a 560-15 tire starts with confirming that the car is staying with the bias-ply fitment path rather than moving to the 155R15 radial option. Within 560-15, the meaningful differences include brand, sidewall style, tire series, and wheel-width compatibility across the available Firestone, US Royal, Coker Classic, and Pro-Trac offerings.

Appearance matters more in this size than many buyers expect because blackwall, narrow whitewall, and wide whitewall versions create very different visual results. It also helps to compare how the car will be driven, whether the wheels are original-style dimensions, and whether a restoration-oriented look or a more specialized use is guiding the decision.

The 1968 Morgan 4-4 Series has blackwall options in both 155R15 radial and 560-15 bias-ply form, while the 560-15 bias-ply lineup also includes narrow whitewall and wide whitewall choices. That means sidewall appearance varies mainly within the bias-ply fitment rather than the radial fitment.

Sidewall style can change the entire look of a small British sports car, so it is worth deciding whether the goal is understated, dressier, or more restoration-minded. Once the visual direction is clear, compare the available brands and tire series in that style and make sure the chosen tire still matches the wheel and fitment setup.

Tires for the 1968 Morgan 4-4 Series are available from Firestone, Michelin, Avon, Vredestein, US Royal, Coker Classic, and Pro-Trac. The brand mix changes by size, with the 155R15 radial fitment centered on Firestone, Michelin, Avon, and Vredestein, while 560-15 bias-ply choices include Firestone, US Royal, Coker Classic, and Pro-Trac.

Brand alone should not be the only deciding factor. It is more useful to narrow the choice by correct size, construction, sidewall treatment, and tire series first, then compare brand options within that group. That approach keeps the decision tied to how the Morgan is equipped and how the tire should look on the car.

For a period-style 1968 Morgan 4-4 Series, the 560-15 bias-ply fitment is the natural starting point because it preserves the older numeric size format and traditional construction. That size is available in blackwall, narrow whitewall, and wide whitewall versions, giving the car very different visual personalities within the same basic fitment.

The right appearance depends on how the car is being restored and which era-specific look the owner wants to emphasize. Exact originality should be checked against marque references, period photos, or other vehicle-specific documentation, but 560-15 remains the most restoration-oriented path before moving into sidewall and brand choices.

Tire construction affects more than ride and handling on a restored 1968 Morgan 4-4 Series because it also changes the car's visual stance and period impression. A 560-15 bias-ply presents the Morgan in a more traditional way, while a 155R15 radial keeps the fitment narrow but gives the car a more modern construction profile.

That distinction matters when the goal is to balance road use with restoration character. Some owners stay with bias-ply for a more vintage presentation, while others consider a radial or a bias-look radial equivalent to keep a traditional look with a different construction type. Wheel width and overall proportions still deserve a final check.

Yes, modifications can affect tire fitment on a 1968 Morgan 4-4 Series even when the tire size itself is correct. Changes such as aftermarket wheels, altered wheel width, suspension work, ride-height changes, or body repairs can all influence how a 560-15 or 155R15 tire sits within the car.

That is why the wheel and chassis should be treated as the car's current setup, not just its original specification. A modified Morgan may need extra attention to steering clearance, fender space, and tire-to-suspension room before a final choice is made, especially when moving between bias-ply and radial constructions.

Before driving a 1968 Morgan 4-4 Series on new tires, inspect the wheels for correct diameter and width, verify that the tires are properly seated, and confirm inflation pressure for the selected tire. It also makes sense to check for adequate clearance at the fenders, suspension, and steering components through the full range of movement.

Older sports cars benefit from a broader walk-around before road use. Look for loose or worn suspension parts, uneven ride height, fluid leaks that could contaminate the tires, and any sign of rubbing after the first short drive. Rechecking pressure and clearance after initial use helps catch small fitment issues before they become bigger ones.

560-15 tires on a collector 1968 Morgan 4-4 Series should be maintained with regular pressure checks, visual inspection of tread and sidewalls, and careful monitoring for cracking, cuts, bulges, or slow air loss. Cars that see limited mileage deserve extra attention because tire aging can matter as much as tread wear.

Storage conditions play a major role with collector vehicles. Keeping the Morgan away from prolonged sunlight, excess heat, moisture, and ozone sources can help preserve the tires between drives. It is also smart to inspect the tires before every outing and after any long storage period, even if the car has traveled very few miles.